It's been about a week since I got my Alpha 1. Spent quite a bit of time setting up the camera for bird photography (very easy menu system). Have been going out and taking bird pics. Amazing. The Bird AF is amazing. While it's not perfect, it's close. It truly does lock on to a bird's eye. The AF is fast even when using a 2x TC with a Sony 400mm 2.8. Haven't run into noise issues at higher ISO. Would definitely recommend Sony Alpha 1.